package org.light4j.genericity.wildcard;
// 定义Shape的子类Rectangle
public class Rectangle extends Shape 
{
    // 实现画图方法，以打印字符串来模拟画图方法实现
    public void draw(Canvas c) 
    { 
        System.out.println("把一个矩形画在画布" + c + "上");
    } 
}
